HUMID AIR CORROSION OF CARBON STEEL – STAINLESS STEEL WELDS IN THE PRESENCE OF Γ-RADIATION


41th Annual CNS-CNA Student Conference - 2017 June 05

Presented at:
41th Annual CNS-CNA Student Conference
2017 June 05
Location:
Niagara Falls, ON Canada
Session Title:
Student Posters, Wine-&-Cheese Reception

Authors:
M. Zakeri (Western University)
M. Momeni (Western University)
M. Li (Western University)
J. Joseph (Western University)
O. Yong (OPG)
J.C. Wren (Western University)
  

Abstract

Carbon steel and 304L stainless steel are utilized in CANDU® nuclear reactors, and in the end-shield region are welded to each other using 309 stainless steel. Humid air radiolysis in this region produces both HNO3 and H2O2, creating corrosive conditions. Test samples were exposed to air at 50° C and 100% humidity in sealed containers with and without radiation; it was found that the carbon steel-weld region corroded only under radiation. Electrochemical experiments indicate that the corrosion rate increased significantly at the lower pH caused by HNO3 production. The presence of H2O2 had little effect on the corrosion rate.

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